Which is correct.
Torn and missing asphalt shingles were observed at multiple locations throughout the roof of the residence.
Torn and missing asphalt shingles was observed at multiple locations throughout the roof of the residence.
Torn and missing asphalt shingles were observed at multiple locations on the roof of the residence. I prefer: Torn and missing asphalt shingles were observed in several places on the roof of the residence.
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Torn and missing asphalt shingles were observed at multiple locations on the roof of the residence.
I prefer:
Torn and missing asphalt shingles were observed in several places on the roof of the residence.